[Offline Pages] Make prerenderer notify us of network progress.

chrome/browser/android/offline_pages/prerender_adapter.h

Index: chrome/browser/android/offline_pages/prerender_adapter.h
diff --git a/chrome/browser/android/offline_pages/prerender_adapter.h b/chrome/browser/android/offline_pages/prerender_adapter.h
index ca378d74d23aa418db7ef9ae8f308d78309c35dd..c60296e441a7c21741c45665004c6031f877d244 100644
--- a/chrome/browser/android/offline_pages/prerender_adapter.h
+++ b/chrome/browser/android/offline_pages/prerender_adapter.h
@@ -40,6 +40,10 @@ class PrerenderAdapter : public prerender::PrerenderHandle::Observer {
     // WebContents (via |GetWebContents()|) have become invalidated.
     virtual void OnPrerenderStop() = 0;
 
+    // Signals that a resource finished loading and altered the running byte

[Pete Williamson, 2017/02/15 01:17:45]

is bytes a cumulative total of bytes loaded, or new bytes since last callback?

[dewittj, 2017/02/17 23:20:15]

This is a cumulative total.  Will update the comment.

+    // count.
+    virtual void OnNetworkBytesChanged(int64_t bytes) = 0;
+
    protected:
     Observer();
     virtual ~Observer();
@@ -83,6 +87,7 @@ class PrerenderAdapter : public prerender::PrerenderHandle::Observer {
   void OnPrerenderStopLoading(prerender::PrerenderHandle* handle) override;
   void OnPrerenderDomContentLoaded(prerender::PrerenderHandle* handle) override;
   void OnPrerenderStop(prerender::PrerenderHandle* handle) override;
+  void OnNetworkBytesChanged(prerender::PrerenderHandle* handle) override;
 
  private:
   // At most one prerender request may be active for this adapter and this